hi,

its good to know that you are planning for your future from an early stage, bba course is related with business analytics, finance analysis, corporate management etc. it would be best if you go for some work related with bba after completing your graduation, also you may do preparation along with your work for cat, mat/ cmat like exams, to get into top colleges you need to have a good score in competitive exam, however you may also join mba course just after completing bba, however you need to practice questions and solve aptitude problems along with your regular college studies.